Signature inversion -- manifestation of drift of the rotational axis in triaxial nuclei

Abstract

A possible scheme of realizing shell model calculations for heavy nuclei is based on a deformed basis and the projection technique. Here we present a new development for odd-odd nuclei, in which one starts with triaxially-deformed multi-quasi-particle configurations, builds the shell-model space through exact three-dimensional angular-momentum-projection, and diagonalizes a two-body Hamiltonian in this space. The model enables us to study the old problem of signature inversion from a different view. With an excellent reproduction of the experimental data in the mass-130 region, the results tend to interpret the phenomenon as a manifestation of dynamical drift of the rotational axis with presence of axial asymmetry in these nuclei.

arXiv comment10 pages, 5 figures

References in corpus (6)

• Triaxial projected shell model approach
• Quadrupole Pairing Interaction and Signature Inversion
• Roles of triaxiality and residual interaction in signature inversions of A~130 odd-odd nuclei
• Transition quadrupole moments in gamma-soft nuclei and the triaxial projected shell model
• Nuclear magnetic dipole properties and the triaxial deformation
• Multi-Shell Shell Model for Heavy Nuclei

Cited by in corpus (17)

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• Mixing of quasiparticle excitations and gamma-vibrations in transitional nuclei
• Angular Momentum Projected Configuration Interaction with Realistic Hamiltonians
• Chiral geometry and rotational structure for ${}^{130}$Cs in the projected shell model
• Shell model method for Gamow-Teller Transitions in heavy, deformed nuclei
• Multi-chiral facets in symmetry restored states: Five chiral doublets candidates in even-even nucleus ${}^{136}$Nd
• Nuclear matrix elements of neutrinoless double-$\beta$ decay in the triaxial projected shell model
• Improved basis selection for the Projected Configuration Interaction method applied to heavy nuclei
• Infinitesimal cranking for triaxial angular-momentum-projected configuration-mixing calculation and its application to the gamma vibrational band
• Signature splitting in ${}^{173}$W with triaxial particle rotor model
• Deformed shell model results for two neutrino positron double beta decay of ${}^{84}$Sr
• Two-phonon $\gamma$-vibrational states in rotating triaxial odd-$A$ nuclei
• Projected shell model description for nuclear isomers